EP0065309B1 - Vorrichtung zum Anlegen eines Kopierblattes an eine umlaufende Fototrommel - Google Patents

Vorrichtung zum Anlegen eines Kopierblattes an eine umlaufende Fototrommel Download PDF

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Publication number
EP0065309B1
EP0065309B1 EP19820104316 EP82104316A EP0065309B1 EP 0065309 B1 EP0065309 B1 EP 0065309B1 EP 19820104316 EP19820104316 EP 19820104316 EP 82104316 A EP82104316 A EP 82104316A EP 0065309 B1 EP0065309 B1 EP 0065309B1
Authority
EP
European Patent Office
Prior art keywords
copy
sheet
pair
balancer
copy sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19820104316
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0065309A2 (de
EP0065309A3 (en
Inventor
Lajos Szekely
Gábor Bereck
László Dipl.-Masch.-Ing. Bernath
György Dipl.-Masch.-Ing. Neumann
Jószef Kiss
Lajos Szilveszter
Károly Toth
Jószef Jaszter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Irodagepipari Es Finommechanikai Vallalat
Original Assignee
Irodagepipari Es Finommechanikai Vallalat
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Irodagepipari Es Finommechanikai Vallalat filed Critical Irodagepipari Es Finommechanikai Vallalat
Publication of EP0065309A2 publication Critical patent/EP0065309A2/de
Publication of EP0065309A3 publication Critical patent/EP0065309A3/de
Application granted granted Critical
Publication of EP0065309B1 publication Critical patent/EP0065309B1/de
Expired legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/163—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using the force produced by an electrostatic transfer field formed between the second base and the electrographic recording member, e.g. transfer through an air gap
    • G03G15/1635—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using the force produced by an electrostatic transfer field formed between the second base and the electrographic recording member, e.g. transfer through an air gap the field being produced by laying down an electrostatic charge behind the base or the recording member, e.g. by a corona device
    • G03G15/164—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using the force produced by an electrostatic transfer field formed between the second base and the electrographic recording member, e.g. transfer through an air gap the field being produced by laying down an electrostatic charge behind the base or the recording member, e.g. by a corona device the second base being a continuous paper band, e.g. a CFF

Definitions

  • the invention relates to a device for applying a copy sheet to a revolving photo drum, with a driven feed roller pair and a driven output roller pair arranged above the same, which are arranged on the side of the photo drum on which the direction of movement of which is directed upwards, at a distance from the photo drum , and with a guide device, by means of which the copy sheet can be fed laterally from below along a guide path between the feed roller pair and the output roller pair of the photo drum and can be deflected upwards in an arc in the direction opposite the feed direction to the output roller pair and in the region of the apex of the Guideway can be placed laterally on the photo drum.
  • a device of this type is known from US-A-4 218128.
  • the copy sheet is held on the desired guide path from the pair of feed rollers to the pair of discharge rollers by guide plates and additional pressure and guide rollers.
  • the contact between the photo drum and the copy sheet required for a perfect transfer of the image is ensured in particular by a pressure roller arranged directly behind the corona, as seen in the transport direction of the copy sheet, by means of which the copy sheet is held in contact with the photo drum.
  • the known device is very complex due to the encapsulation of the guideway to the outside by the guide plates, but also the unobstructed view of the copy sheet guide, which occurs when the copy sheet jams occasionally, are impossible is desired for a quick remedy of the fault.
  • the large number of driven rollers or pairs of rollers causes synchronization problems between the guide and drive devices of the copy sheet guide and the photo drum.
  • the object of the invention is to develop a device of the type mentioned at the outset in such a way that as few driven conveying elements or conveying rollers as possible are required for the transport of the copying sheet along the guideway, with a largely unobstructed view of the copying sheet guide, without any regard to the synchronization still has to be accepted due to insufficient contact between the copy sheet and the photo drum defects.
  • the guide device has a guide rocker which is mounted at a distance from its center of gravity and which can be freely pivoted through 360 ° about an axis running parallel to the axis of the photo drum, from a basic position which it assumes under its weight Hook with a catch notch arranged in the basic position of the rocker in the path of the leading copy sheet edge emerging from the roller nip of the feed roller pair, so that the rocker can be pivoted upwards against its weight from the basic position under the drive of the feed roller pair by means of the copy sheet supplied by it
  • This causes the deflection of the copy sheet and its application to the photo drum, and one which leads the leading copy sheet edge at a lift-off point at which the swing arm with the catch notch of its hook has passed the upper vertex of its swivel sheet from the catch notch and the roller gap t of the output roller pair supplying output guide device.
  • Another major advantage of the copy sheet guide according to the invention is in particular that the elasticity of the guide device consisting essentially of a rocker and hook without additional guide devices in the area of the apex of the guideway causes the copy sheet to bulge in the direction of the photo drum and, consequently, makes it very easy to apply to it Photo drum can be reached.
  • the elasticity of the guide device can be achieved, for example, by an articulated attachment of the hook to the rocker.
  • the hook is designed as a spring arm protruding from the end of the rocker plate, the free end of which is approximately Z-shaped to form the catch notch.
  • a separate stop or a catch device for the rocker can be arranged in the area of the pair of feed rollers. It has proven to be particularly advantageous, however, that a guide gap for the copy sheet connects to the roller gap of the feed roller pair at the outlet thereof and the upper boundary plate of the guide gap is designed as a catch plate, on the free edge of which the spring arm's hook of the rocker arm, which closes when it swings its resilient braking with the hook strikes the boundary plate until the catch notch formed in the hook slides onto the mouth of the guide gap.
  • the running edge of the copy sheet is lifted out of the hook of the rocker at the end of the guideway by the output guide device, which preferably has a lifting lever which can be pivoted about an axis arranged between the photo drum and the rocker axis parallel to this against the force of a return spring the swinging arm, which crosses the upper vertex of its swivel arc, can be taken along by means of a stop, from which the lifting lever slides off at the point of extraction when the leading copy sheet edge arrives and, under the force of the spring, lifts the leading copy sheet edge up to a position in which the leading copy sheet edge rises the roller gap of the output roller pair is aligned.
  • no driven roller or roller is required for the copy sheet guide device according to the invention in the region of the output guide device, through which the copy sheet is conveyed out of the guide track to the pair of output rollers.
  • the output guide device has an additional drive roller to which the paper sheet that has been lifted out can be placed by means of the lifting lever.
  • FIG. 1 schematically shows the guideway 1 of a copy sheet 2 which is brought to a photo drum 3 for transferring a toner image in such a way that in area 4 of a corona (not shown here) there is a flat contact between the photo drum 3 and copy sheet 2. Among other things, this promotes the quality of the transferred toner image.
  • the copy sheet 2 drawn from a copy sheet cassette passes via a driven feed roller pair 5 and through an adjoining guide gap formed between a limiting plate 6 and a lower guide plate 7 into the guide path provided for the transfer of the toner image 1 (Fig. 1).
  • the ends 8 of the boundary plate 6 and the guide plate 7 which face the pair of feed rollers 5 are bent open in a mouth shape, so that the leading edge of a fluttering copy sheet 2 is also captured and threaded into the guide gap with certainty.
  • the guide plate 7 consists of a section 9 which runs parallel to the boundary plate 6 and a deflection part 10 which is angled in steps from the boundary plate 6 and is then curved in accordance with the guide path 1 and which ends at a short distance from the photo drum 3.
  • the limiting plate 6 is formed except for the end 8 as a flat plate, the end facing the photo drum 3 protruding beyond the step in the guide plate 7 and serving as a stop surface 11 for a hook 12 which acts as a rocker arm 13a from the end of the heavier swing arm 13a
  • Spring arm 14 protrudes approximately tangentially from the radial edge of the swing arm 13a in the counterclockwise direction and a catch notch 15 is bent at its free, approximately Z-shaped end.
  • the convex bend 16 of the free end of the spring arm 14 seen from the pair of feed rollers 5 interacts with the stop surface 11 as a stop.
  • the catch notch 15 is formed from the pair of feed rollers 5 as a concave curvature.
  • the apex of the catch notch 15 lies at the level from the guide gap leading edge of the copy sheet 2 emerging between the boundary plate 6 and the guide plate 7.
  • the length of the swing arm 13a is dimensioned such that a smooth movement between the hook 12 or catch notch 15 on the one hand and the guide plate 7 or its deflecting part 10 on the other hand is possible.
  • the rocker 13 is mounted at point 17. Due to the high elasticity of the system of rocker 13 and spring arm 14, the movement path of the free end of the spring arm 14 can deviate from the circular path predetermined by the length of the swing arm 13a. This enables a flat contact between the photo drum 3 and the copy sheet 2 in the area of the corona 18 in a simple manner.
  • a plate 20 is fastened here, for example, to the rear wall of the corona housing, at the upper free end of which a spring 21 is suspended, the other end of which is attached to one Lifting lever 22 is attached.
  • the lifting lever 22 is articulated at one end to the plate 20 at point 23. Its other end, which makes up about a third of its total length, is bent counterclockwise at an obtuse angle x of approximately 150 °. The end of the bent part of the lifting lever 22 projects radially beyond the circular path described by the swing arm 13a in the starting position thereof (FIG. 2).
  • An essential feature of the copy sheet guide according to the invention is, in particular, that the rocker 13 and lifting lever 22 have spaced-apart bearing points 17 and 23, so that an intersection of the circles described by the rocker or swing arm 13a and lifting lever 22 is achieved, which is approximately lies at the intersection of a straight line passing through the bearing points 17 and 23 with the circle of the rocker 13.
  • a drive roller 25 is arranged such that it comes into contact with the copy sheet 2 running along the tangent through the gap of the output roller pair 24 to the guideway 1.
  • the free end of the lifting lever 22 extends almost to this tangent, so that a copy sheet 2 resting on the drive roller 25 also bears against the upper end edge of the free end of the lifting lever 22 and is supported by it, so that the copy sheet 2 is reliably bent off in the direction (arrow 36) of the circle described by the swing arm 13a is avoided.
  • the lifting lever 22 assumes a position defined by a stop 28 between the drive roller 25 and a guide plate 26, the guide surface 27 of which lies in the plane of the aforementioned tangent.
  • the end of the guide plate 26 facing the photo drum 3 is bent such that copy sheets 2 abutting the guide plate 26 below the tangent are also guided to the guide surface 27.
  • a driving pin 29 projecting in the direction parallel to the axis of the rocker 13 is arranged.
  • the driving pin 29 By means of the driving pin 29, when the rocker 13 rotates, the lifting lever 22 is carried against the spring force of the spring 21.
  • point P that is the intersection of the circle described by the leading edge of the swing arm 13a or by the driving pin 29 with the from the free end of the lifting lever 22, which is pivoted about the bearing 23 clockwise, described Circle, swing arm 13a and lifting lever 22 disengage, so that the lifting lever 22 springs back under the force of the spring 21 into the position predetermined by the stop 28.
  • a locking lever 31 is pivotally suspended at point 30, which is held in the rest position under the force of a spring 32 in the position shown in FIG. 2.
  • the locking lever 31 has on its side facing the photo drum 3 a locking lug 33 which is formed above the horizontal diameter of the circle described by the swing arm 13a on the locking lever in the form of a projecting rake.
  • This latch 33 can hold the swing arm 13a in the position (locking position) of the locking lever 31 shown in FIG. 3.
  • the locking position of the locking lever 31 is achieved by pivoting it about the axis 30 in a clockwise direction. The pivoting takes place against the spring force of the spring 32.
  • the locking lever 31 projects through in the starting position (FIG. 2) with its free end the limiting plate 6 and the guide plate 7, which are slotted accordingly up to the point 34.
  • the leading edge of the copy sheet 2 engages in the catch notch 15 after leaving the guide gap and moves the swing arm 13a clockwise along the guideway 1 via the spring arm 14. During this movement process, the copy sheet 2 is bent and radial according to the resulting weight of the swing arm 13a supported from the outside on the deflection part 10 of the guide plate 7. In the area of the corona 18, the copy sheet 2 comes into flat contact with the photo drum 3 under the resulting weight of the swing arm 13a.
  • the driver pin 29 Shortly after the apex of the upper half of the guideway 1 has been exceeded, the driver pin 29 comes into engagement with the lifting lever 22, which is thereby pivoted in a clockwise direction against the force of the spring 21 about the axis 23. As soon as the leading edge of the swing arm 13a provided with the driving pin 29 has passed through the point P (FIG. 3), the lifting lever 22 which has been carried along until then is released and pivoted back into the position shown in FIG. 2 under the force of the spring 21.
  • the swing arm 13a is held by the locking lug 33 formed in the locking lever 31 (FIG. 3). As soon as the trailing edge of the copy sheet 2, however, has released the free end of the locking lever 31 and has springed back into its starting position by the spring 32, the swing arm 13a comes out of engagement with the latching lug 33. Characterized the - here longer - swing arm 13a down until it hits the end of its spring arm 14 on the boundary plate 6 and slips over the free edge.
  • the copy sheet is transported exclusively by the drive roller 25 and by the pair of output rollers 24.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Discharge By Other Means (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
EP19820104316 1981-05-18 1982-05-17 Vorrichtung zum Anlegen eines Kopierblattes an eine umlaufende Fototrommel Expired EP0065309B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU139281A HU181331B (en) 1981-05-18 1981-05-18 Rocker sheet guiding device particularly for picture transmitting unit of electrophotographic duplicator
HU139281 1981-05-18

Publications (3)

Publication Number Publication Date
EP0065309A2 EP0065309A2 (de) 1982-11-24
EP0065309A3 EP0065309A3 (en) 1983-06-15
EP0065309B1 true EP0065309B1 (de) 1984-04-04

Family

ID=10954258

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820104316 Expired EP0065309B1 (de) 1981-05-18 1982-05-17 Vorrichtung zum Anlegen eines Kopierblattes an eine umlaufende Fototrommel

Country Status (6)

Country Link
EP (1) EP0065309B1 (cs)
CS (1) CS336482A2 (cs)
DD (1) DD202603A5 (cs)
DE (1) DE3260091D1 (cs)
HU (1) HU181331B (cs)
PL (1) PL129961B1 (cs)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4218128A (en) * 1977-01-11 1980-08-19 Ricoh Company, Ltd. Duplex copying machine
DE2925323A1 (de) * 1979-06-22 1981-01-22 Siemens Ag Elektrographisches geraet

Also Published As

Publication number Publication date
HU181331B (en) 1983-07-28
CS336482A2 (en) 1985-07-16
DD202603A5 (de) 1983-09-21
EP0065309A2 (de) 1982-11-24
PL129961B1 (en) 1984-06-30
EP0065309A3 (en) 1983-06-15
DE3260091D1 (en) 1984-05-10
PL236486A1 (cs) 1982-12-06

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